What Does Matter ?

If you got a psp with a CFW higher than 1.5 ( Mine  is 5.00 ),  You can not run Homebrew ( HomeMade) Application on it . If you want to run Homebrew application ( Apps like Bookr or psppdf or … ) you gotta downgrade it to CFW version 1.5.  Here is two way to achieve that :

1.You can use Time machine , here is instruction how to install it.

If you wanna try Time machine , You need a lot of stuff including : JigKick Battery ( Pandora’s Battery) . 1.50 EBOOT.PBP download, 3.40 EBOOT.PBP download, 360.PSAR download , Time machine itself download
Consider that Time machine currently just support :> Classic PSP: Offical 1.50, 3.40 OE. Slim PSP: Modified 1.50 (with 3.40 modules for Slim support), 3.60 M33 Dark_AleX a

I got a 5.00 M33-6 so time machine is not an option to me

2.Using LEDA

In my idea best solution is  LEDA ( Legacy Software Loader )
You can download it easily from here its just about 72 KB ( think of time machine for a moment , time machine and all of the stuff it needs are about 52 MB ). Okay When download finished just extract it and Copy the “LEDA” folder to ms0:/PSP/GAME/ , alright now disconnect your psp from your computer and go to Game and Run LEDA , it will process something for a less than a minute and then you will see “finished” then it will automatically close. Congratulation its finished, just go and get some homebrew and copy them to your psp and enjoy them.